Condensing-lens mount.



J. M. GUTHRIE & H. G. POST.

CONDENSING LENS MOUNT.

APPLICATION FILED DEC. I6. 1914.

Patented Aug. 24, 1915.

2 SHEETS-SHEET 1.

.JMTHRIE- attorney J. M. GUTHRIE & H. G. POST.

CONDENSING LENS MOUNT.

APPLICATION FILED 02c. 16. 1914.

Patented Aug. 24, 1915.

2 SHEETS-SHEET 2.

Hlllll .IPTGUTHRIIE- v HPU 5T.

JOHN M.

GUTHRIE AND HARRY G. POST, OF GROVE CITY, PENNSYLVANIA.

CONDENSING-LENS MOUNT.

Specification of Letters Patent.

Patented Aug. 24, 1915.

Application filed December 16, 1914. Serial No. 877,526.

To all whom it may concern:

Be it known that we, JOHN M. GUTHRIE and HARRY G. Pos'r, citizens of theUnited States, residing at Grove City, in the county of Mercer and Stateof Pennsylvania, have invented certain new and useful Improvements inCondensing-Lens Mounts, of which the following is a specification.

This invention relates to new and useful improvements in lens mounts andmore particularly to acondensing lens mount adapted for use inconnection with motion picture projection machinery or in any case wherea condensing lens is used singly or in multiple in connection with anelectric arc lamp or any source of light from which the heat causes thelens breakage. An object of this invention is to provide a positivemeans for preventing the breakage of lens such as is caused from theheat produced by the lamp, the prevention of such breakage beingaccomplished by the provision of heavy metal rings or the likeencircling the outer edges of said lens these rings being so constructedas to allow for the expansion of the glass lens in heating up and alsoby the provision of a considerable bulk of metal in close proximity withthe edges of the lens, this bulk of metal being provided to hold theheat longer than the lens and to radiate some of this heat to the glasslens in the process of cooling thus providing heat for the thinner edgesof the glass lens and generally causing the glass to cool slowly andevenly.

Another object of this invention is to provide a means for holding thelenses in pairs so the same will always stand parallel to each other,this being accomplished by the construction of the rings or like inwhich the lenses are mounted in such a manner so as to always assume aposition parallel to each other from their own weight.

A further object of this invention is to provide a suitable and simplemeans for adjusting the lens so asto obtain the desired distancetherebetween, this being accomplished by the rear lens being mounted inits respective ring which is formed therefrom a tubular casing proper,while the front lens is mounted in a similar hand ring which telescopesthe tubular casing at the forward end thereof. The forward and rearwardmovement of this last mentioned lens is accomplished by means of anoperating handle substantially secured to the said ring and guided inthe desired direction by means of a plurality of spiral slotscooperating with the same.

A still further object of this invention is to provide a means wherebyaccess to the lens may be readily obtained should the same requirecleaning or replacing and this 'is accomplished by constructing thetubular casing proper and ring formed therefrom of the two parts joinedby a suitable hinge and held substantially together when desired by asuitable locking means. The front and telescoping ring is alsoconstructed of two parts substantially held in alinement with each otherby means of lugs formed upon one section thereof and fitting snugly intorecesses formed in the other section thereof. Thus it will be readilyunderstood that when the hinged upper section of the tubular casingproper is raised the upper section of the telescoping ring may then bereadily removed and both lenses will then be exposed for cleaning orremoval as desired.

With the above and other objects in view this invention resides in thenovel feature of construction, formation, combinations, and arrangementof parts to be hereinafter more fully described, claimed, andillustrated by the accompanying drawings in which:

Figure 1 is a top plan view of our lens mount. Fig. 2 is a frontelevation of the same. Fig. 3 is a top plan view of thesame with uppersection raised. Fig. 4 is a sectional view of our lens mount taken online H of Fig. 1. Fig. 5 is a perspective view of the telescoping metalhand ring removed.

Referring to the accompanying drawings by similar characters ofreference for corresponding parts throughout the different views thenumeral 10 designates in general our improved lens mount which iscomposed of a tubular casing 11 having the customary extensions 12formed thereon by their opposite sides are substantially locked.

together when desired by a suitable locking means 14. Formed on theinner terminal of this tubular casing 11 is a flange 11' having a groove15 formed therein thus producing a metal ring 16 in which is looselymounted the rear lens 17, while telescoping the forward end of thecasing 11 is a metal band ring 18 having a similar flange 18 formedthereon at the inner end thereof and having a similar groove 15 formedtherein for the reception of the front lens 19 which is also looselymounted therein,

thus producing a second ring 20, the forward end of which extendsconsiderably in advance of the ring 20 proper, as indicated by thenumeral 20. This band ring 18 is also equally divided into an uppersection 0 and lower section D both of which are held substantially in'alinement to each other by means of lugs 21-substantially extending.

from the lower ends of the section C and snugly fitting into recesses 22formed in the upper ends of the lower section D. Both of these metalrings 16 and 20 are so constructed as to have the bulk of the metalcomposing the same in close proximity with the edges of the lens asclearly illustrated by Fig. 4 of the accompanylng drawings.

and designated by the numeral 23 the object of which having previouslybeen stated.

Formed in the upper section A of the tubular casing '11 and in the lowersection B are suitable means 24 through which project studs 25 and 26substantially secured to the upper and lower sectionsC and D of the bandring- 18. Substantially secured to the stud 26 is an operating handle 27while secured to the stud 25 is a thumb screw 28 thus it will be readilyunderstoodthat the handle ,27 and thumb screw' 28 cooperating with themeans 24- provided by the up er section A and lower section B of thetubu a'r' casing 11 produce a means whereby the band ring 18 may bemoved inwardly or outwardly as desired by the operating handle 27this-feature being clearly illustrated by Fig. 1 of the accompanyingdrawings which shows the band ring 18 in its'outmost position, in dottedlines. It may be further stated that the thumb screw upon beingtightened to its full extent will produce a locking means for the bandring 18 thus preventing the undesired movement of the same.

To gain access to this lens mount is very 1110; the thumb screw 28 fromthe stud 25,

then upon releasing the locking means 14 of the tubular casing 11, theupper section A of the casing may then be raised and the upper section Cof the band ring 18 removed therefrom thus allowing free access to bothlenses whereby the same may be cleaned or gradually obtained. Thistelescoping movement of the front lens is readily obtained through thecooperation of the spiral slots 24 of the tubular casing 11 with thethumb screw 28 and operating handle 27, the spiral slots 24 serving-as aguide means for the same which feature is also clearly illustrated byFig. 1 of the accompanying'drawings.

It is now thought that the above description of the operation of ourlensmount together with the accompanying drawings is, sufficient to givethose familiar with this art a clear idea. asto the construction andoperation of the same. It should be understood, however, in thisconnection'that various minor changes in the details of construction maybe resorted to within the scope of the appended claims, withoutdeparting from or sacrificingany of the advantages of this invention.

From the foregoing disclosure taken in connection with the accompanyingdrawings, it'will' be manifest that we have proa condensing lens mountwhich will.

vided fulfil all of the necessary requirements of .such a device, andwhich may be adapted for use wherever the services'of' such a device arerequired.

Having thus fully descnbed this invention, what we claim and wish toprotect by Letters Patent is:

1. A-lens mount comprising a tubular casing, a means provided by saidtubular cas- '2. A lens mount comprising a tubular cas- I ing a ringformed'therefrom the inner ter- ".minal thereof and having a grooveformed therein for the reception of a lens, a band ring telescoping thesaid tubular casin and having a groove formed therein for t e receptionof another lens, a means provided In testimony whereof we afiix oursignaby the tubular casing and the band ring tures in presence of twowitnesses.

whereby access to both lenses may be ob- JOHN M. GUTHRIE. mined. :1means for substantially locking HARRY G. POST.

the said tubular casing, and band ring there- \Vitnesses: in and meansfor slidably operating the E. F. ATWELL, said band ring therein. C. G.HARsHAw.

